def dayUP(df):
    dayup = 1
    for i in range(365):
        if i % 7 in [6,0]:
            dayup = dayup*(1 - 0.01)
        else:
            dayup = dayup*(1 + df)
    return dayup
df=0.01
while dayUP(df)<37.78:
    df+=0.001
print("工作日的努力参数是: {:.3f}".format(df))
